<template>
  <div class="todo-header">
    <input v-model="title"  type="text" placeholder="请输入你的任务名称,按回车键确认" @keyup.enter="add">
  </div>
</template>

<script>
    import {nanoid} from 'nanoid'
    export default {
        name: 'MyHeader',
        props: ['addTodo'],
        data () {
            return {
                title: ''
            }
        },
        methods: {
            add (e) {
                //校验数据
                if(!this.title.trim()) return alert('输入不能为空')
                //将用户的输入包装成为一个todo对象
                const todoObj = {
                    id: nanoid(),
                    /*title: e.target.value,*/
                    title: this.title,
                    done: false
                }
                // console.log(todoObj)
                // 通知app组件去添加一个todo对象
                this.addTodo(todoObj)
                // 清空输入
                this.title = ''
            }
        },
        mounted () {
            console.log(this.addTodo)
        }
    }
</script>

<style scoped>
    /* header  */
    .todo-header input{
        width: 560px;
        height: 28px;
        font-size: 14px;
        border: 1px solid #ccc;
        border-radius: 4px;
        padding: 4px 7px;
    }
    .todo-header input:focus {
        outline: none;
        border-color: rgba(82,168,236,.8);
    }
</style>